LIGHT-WEIGHT BACKFILLING MIXTURE Russian patent published in 2009 - IPC E21B33/00 

FIELD: oil and gas production.

SUBSTANCE: invention refers to oil and gas industry, particularly to backfilling materials and can be implemented at cementing of cased columns overlapping intervals of penetrable beds and beds with low gradients of hydro-break and normal temperature. A light-weight backfilling mixture contains oil-well Portland cement, a light-weight additive - carry-over ashes, condensed micro-silica MC-85 or MC-65 and modified sodium silicate "Monasil" at following ratio of components, wt %: Backfilling Portland cement 47-49; Carry-over ashes of HS 45-47; Condensed micro-silica MC-85 or MC-65 3-5; Modified sodium silica "Monasil" 1-2.

EFFECT: production of light-weight backfilling mixture with upgraded flowability forming expanding stone of increased hardness and adhesion with metal in process of solidifying.

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